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The aqueous extract of Laminaria ochroleuca was investigated for its antifungal activity and evaluated as an inducer of wheat plant defence against Helminthosporium leaf blight caused by Bipolaris sorokiniana and Alternaria disease caused by Alternaria alternata. The quantitative and qualitative severity of the diseases was assessed based on the typical symptoms observed in wheat plants six weeks after inoculation. The application of algae extract at various concentrations (5 g/L, 10 g/L, 20 g/L) to wheat plants infected with the fungal strains significantly reduced typical disease symptoms by up to 90%. The use of algae extract enhances the accumulation of hydrogen peroxide, polyphenol oxidase, and peroxidase in wheat plants, which stimulate defence mechanisms against the fungal strains, either directly through their toxic effects on pathogens or indirectly by strengthening the plant’s defence systems. The algae extract could be considered a novel elicitor of wheat plant defence. [ABSTRACT FROM AUTHOR]